The download is a Free version of AudioLeak 3 that
performs rapid (over 200 times real-time) peak, A-weighted and
unweighted loudness estimation for audio files (and simultaneous,
multithreaded audio input analysis); it can be enabled with many
additional features with the purchase of an activation code.
Complete information is included with the download in documentation
(accessed from the application Help tab).

New in AudioLeak 3 Professional is live 5.1-channel LKFS (BS 1770)
measurement and unique "Firefly" input level monitoring